The toast is offered daily during the morning only, from 7 a.m. to 10 a.m.

American actually began serving the popular breakfast/ brunch dish at a handful of is airport lounges back in Spring 2018. The entree quickly grew to become a smashing success.

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Media: Katie Wood / SFGATE

The airline expanded the avocado toast bars to 21 other lounges in June, including the location at SFO' Terminal 2. It follows the successful rollout of another dish that capitalizes on the avocado-craze: guacamole.

"Last year we introduced a guacamole station in the afternoons that has been very popular and over the summer we've been testing a few new items in a handful of our lounges," an American Airlines spokesperson told SFGate. "We rely on our customers feedback and testing them in actual lounges helps us adjust and make sure we're offering something our customers will enjoy."

Some of the new items being tested have included turkey sliders and pasta dishes that have been spotted at some Admirals Club locations.

If you thought adding millennial-favorite avocado toast was an attempt to woo younger fliers to American, you'd be mistaken. Based on what frequent fliers tell us, the dish has broad appeal.

On a recent visit to the SFO club, Dr. Ian Cutress couldn't help but notice who was lining up for the complimentary food.

"On announcement the queue was already 4-5 strong, all of whom were middle-to-late aged men in suits," he said.

Photo: American Airlines

Toppings include prosciutto, smoked salmon, and boiled eggs

Toppings include prosciutto, smoked salmon, and boiled eggs

American flier Evan Behar saw something similar on a recent visit.

"Most of the people in this lounge are one to two generations older than me," he tweeted, "I don't want to hear anyone yelling about millennials and their avocado toast ever again."

The avocado toast bars should be around for the foreseeable future given the rousing reception, although when asked, American declined to comment about how long they'd be around.

Access to Admirals Clubs is limited to members, day pass holders, and certain American and OneWorld elites traveling on specific itineraries, including First or Business class customers flying on American's transcontinental flights between San Francisco and New York-Kennedy.

What do you think of the fare at AA or other airline lounges? What's the best or worst thing you've eaten at an airport club? Please leave your thoughts in the comments of on our Facebook page.